Clock not updating in menu bar

I'm getting ready to move to a Samsung SSD to help performance, hopefully. I've noticed that the clock in my menu bar sometimes freezes and won't update. If I click the time, it updates to the current time and seems to update as long as I keep using the machine, for the most part.

Can anyone help me understand what's going on? I know PC's had a battery that kept the clock going; not sure about the MacBook Pro. Since I'm going to open it up anyway, if there's something I need to check or change, I could it do it then.

I don't ever remember seeing the clock stop, while the rest of the system remains functional.
The clock stops because the system has stopped responding.
When you notice the clock has stopped, can you do anything more than move the mouse cursor?

I don't ever remember seeing the clock stop, while the rest of the system remains functional.
The clock stops because the system has stopped responding.
When you notice the clock has stopped, can you do anything more than move the mouse cursor?

Click to expand...

Yep, I can still do stuff. Machine responds just fine. I may upgrade to El Capitan once Inget the SSD in, maybe that will fix it. Still running Mavericks right now.

Not sure if iStat updated recently or not. Just checked for an update, but I'm getting "error occurred retrieving update information". I just swapped out my HD (after cloning my original to the new one); not sure if this has anything to do with it.

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